Вычислите: 1. (-2/5/11) + (-1/2/11) - 7/11=2. - (-4/1/16) - 2/3/4+1/1/8=3. (-3/8/13) + (-1/4/13) - 9/13=4. - (-5/1/18) - 3/7/9+1/2/3=

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София Шубина

Математика

20 мая, 12:39

Вычислите: 1. (-2/5/11) + (-1/2/11) - 7/11=2. - (-4/1/16) - 2/3/4+1/1/8=3. (-3/8/13) + (-1/4/13) - 9/13=4. - (-5/1/18) - 3/7/9+1/2/3=

+5

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Даниил Тарасов · Answer 1

1) (-2/5/11) + (-1/2/11) - 7/11 = (-2/5 - 1/2 - 7) / 11 = (-2/5 * 2/2 - 1/2 * 5/5 - 7 * 10/10) / 11 = (-4/10 - 5/10 - 70/10) / 11 = (-79/10) / 11 = - 7,9 : 11 = - 0,72 ~ - 0,7;

2) - (-4/1/16) - 2/3/4 + 1/1/8 = 4/16 - 2/3 : 4 + 1/1 : 8 = 1/4 - 2/3 * 1/4 + 1 * 1/8 = 1/4 - 1/6 + 1/8 = 1/4 * 6/6 - 1/6 * 4/4 + 1/8 * 3/3 = 6/24 - 4/24 + 3/24 = 5/24;

3) (-3/8/13) + (-1/4/13) - 9/13 = (-3/8 - 1/4 - 9) / 13 = (-3/8 - 1/4 * 2/2 - 9) / 13 = (-3/8 - 2/8 - 9) / 13 = (-5/8 - 9) / 13 = - 5/8 : 13 - 9/13 = - 5/8 * 1/13 - 9/13 * 8/8 = - 5/104 - 9/104 = - 14/104 = - 7/52 = - 0,14.

4) - (-5/1/18) - 3/7/9 + 1/2/3 = 5/18 - 3/7 : 9 + 1/2 : 3 = 5/18 - 3/7 * 1/9 + 1/2 * 1/3 = 5/18 - 1/21 + 1/6 = 0,28 - 0,05 + 0,17 = 0,23 + 0,17 = 0,4.